I like the idea of utilizing an actual anchoring system. An autopilot would be a feature I am very interested in. I prefer to be on one ship throughout a mission, which makes it more realistic, however, sometimes you need to use other vessels (see some of my missions with the Titanic).
Of course one system that acts both as autopilot and anchor is the new global postioning management system utilized on the QM2 - where if the ship is plotted to stay in one place and anchors, realistically and virtually, the computer mans the thrusters, azipods, and such to make sure the vessel does not drift out of position.
I too am highly annoyed with the extreme elasticity of the ropes on Ship Simulator. I often go to great lengths to doc the vessel properly, however, if there is a wind and the vessel drifts slightly, then the ropes "snaps" the vessel back towards the dock, therefore causing damage. I think this highly, highly annoying.